Generator Relay?

[Jeff August]

We are having a problem finding the right starter relay for our Perkins
Kohler 12.5, it would cause the starter to chatter and not get full
power so we removed it to find a replacement. We where able to get
other relays from the box but not the starter relay,(center one of
three on back side of box) the suppler says it is a 6 volt unit and is
not available, it has been back ordered for over a month and told us
today it is not likely to ever come. Why or how is this a 6 volt relay
when the rest are 12 volt and easy to get, the Kohler repare company
said to buy a new controler because the one we have is to old to get
parts for. The generator starts fine if you jump the starter but does
nothing now with the old relay back in. Does anyone know where to
possibly get this relay or did someone put the wrong one in before we
became the owners.
The relay is a Portter&Brumfield #KUP14D55 6volt dc
Thankyou very much for any help!
Michelle and Jeff August
1980FC35RB
Plymouth Wi